from django.shortcuts import render

# Create your views here.
from rest_framework.permissions import IsAuthenticated
from rest_framework.views import APIView
from rest_framework.response import Response
from rest_framework import status
from alipay import AliPay
from django.conf import settings
import os

from orders.models import OrderInfo
from payment.models import Payment


class PaymentView(APIView):
    """生成支付宝登录url"""

    # 必须是用户登录
    permission_classes = (IsAuthenticated,)

    def get(self, request, order_id):

        # 获取当前用户
        user = request.user
        # 判断订单信息是否正确
        try:
            order = OrderInfo.objects.get(order_id=order_id, user=user,
                                          pay_method=OrderInfo.PAY_METHODS_ENUM["ALIPAY"],
                                          status=OrderInfo.ORDER_STATUS_ENUM["UNPAID"])
        except OrderInfo.DoesNotExist:
            return Response({'message': '订单信息有误'}, status=status.HTTP_400_BAD_REQUEST)

        # 构造支付宝支付链接地址
        alipay = AliPay(
            appid=settings.ALIPAY_APPID,
            app_notify_url=None,  # 默认回调url
            app_private_key_path=os.path.join(os.path.dirname(os.path.abspath(__file__)), "keys/app_private_key.pem"),
            alipay_public_key_path=os.path.join(os.path.dirname(os.path.abspath(__file__)),
                                                "keys/alipay_public_key.pem"),  # 支付宝的公钥，验证支付宝回传消息使用，不是你自己的公钥,
            sign_type="RSA2",  # RSA 或者 RSA2
            debug=settings.ALIPAY_DEBUG  # 默认False
        )

        # 调用它里面的方法 生成支付宝登录url后面的 查询参数部分
        # 电脑网站支付，需要跳转到https://openapi.alipaydev.com/gateway.do? + order_string
        order_string = alipay.api_alipay_trade_page_pay(
                    out_trade_no=order_id,  # 美多商城订单编号
                    total_amount=str(order.total_amount),  # 一定要把总价转换成字符串类型,不然会报错
                    subject='美多商城%s' % order_id,
                    return_url="http://www.meiduo.site:8080/pay_success.html",  # 支付成功后的回调url
                                                         )

        # 拼接完整 支付宝登录url
        # 沙箱环境 : 	https://openapi.alipaydev.com/gateway.do? + 查询参数部分

        # 真实环境 : 	https://openapi.alipay.com/gateway.do? + 查询参数部分  order_id=xxx&a=xxx

        alipay_url = settings.ALIPAY_URL + "?" + order_string
        return Response({'alipay_url': alipay_url})


class PaymentStatusView(APIView):

    def put(self, request):
        # 获取查询参数中的所有数据 query_params  /django  GET
        # 并将数据转化为字典
        data = request.query_params.dict()
        # 把查询参数中的sign签名部分数据单独提取出
        signature = data.pop("sign")

        # 创建alipay支付对象
        alipay = AliPay(
            appid=settings.ALIPAY_APPID,
            app_notify_url=None,  # 默认回调url
            app_private_key_path=os.path.join(os.path.dirname(os.path.abspath(__file__)), "keys/app_private_key.pem"),
            alipay_public_key_path=os.path.join(os.path.dirname(os.path.abspath(__file__)),
                                                "keys/alipay_public_key.pem"),  # 支付宝的公钥，验证支付宝回传消息使用，不是你自己的公钥,
            sign_type="RSA2",  # RSA 或者 RSA2
            debug=settings.ALIPAY_DEBUG  # 默认False
        )

        # 调用alipay中的verify方法进行验证支付信息
        success = alipay.verify(data, signature)

        if success:
            # 订单编号
            order_id = data.get('out_trade_no')
            # 支付宝支付流水号
            trade_id = data.get('trade_no')
            # 把交易号和订单编号进行绑定存储
            Payment.objects.create(
                order_id=order_id,
                trade_id=trade_id
            )
            # 修改订单状态
            OrderInfo.objects.filter(order_id=order_id, status=OrderInfo.ORDER_STATUS_ENUM['UNPAID']).update(
                status=OrderInfo.ORDER_STATUS_ENUM["UNCOMMENT"])
            return Response({'trade_id': trade_id})
        else:
            return Response({'message': '非法请求'}, status=status.HTTP_403_FORBIDDEN)
